Mold Guides · Room-Specific & Commercial Mold

Mold in Flood-Damaged Homes: Room-by-Room Checks

After a flood, a Louisiana home needs to be checked room by room, because floodwater does not affect every room in the same way, and the mold that follows does not grow in every room at the same time. A room that looks dry may be damp inside the walls. A room that was never flooded may have taken water through the floor. A room that was cleaned quickly may still hold moisture in the materials that were never removed. The only way to know is to look, room by room, with a clear idea of what to look for in each one.

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This guide is a room-by-room post-flood checklist: walls, floors, attic, crawl space, and the rooms of the house, with the professional threshold for large areas. It is general guidance, and it does not replace a professional assessment after a flood. Our mold damage restoration page covers the repair stage, and homes in New Orleans and across Louisiana face the same flood risk.

Walls and floors: the first check

Walls and floors are the first check after a flood, because they are the materials that floodwater touches first and soaks deepest. Look for the waterline on the walls, which shows how deep the water was, and look above it, because moisture wicks up through drywall and plaster beyond the waterline. Look for staining, warping, peeling paint, and a wall that feels soft when it is pressed. Look at the floors for warping, buckling, soft spots, and a musty smell that is stronger near the floor than in the rest of the room.

Do not assume that a wall or a floor is dry because it looks dry on the surface. Floodwater soaks into drywall, insulation, subfloor and wood, and the moisture can stay inside the material long after the surface has dried. Moisture readings are what show how wet the structure is, and they are part of a professional assessment. If the affected area is larger than about ten square feet, EPA guidance is that a professional should handle the work, and a flooded home will usually exceed that threshold in the walls and floors alone.

The living rooms and bedrooms

The living rooms and bedrooms are the rooms where people spend their time, and they are the rooms where the signs of flood damage are most often noticed. Check the walls for the waterline and for staining above it. Check the floors for warping and soft spots, especially near the exterior walls and the doors. Check behind the furniture, where the growth is hidden, and in the corners, where the air is stillest. Check the windows and the doors for water that came in around the frames, and for the staining that shows where it went.

Check the furniture and the belongings too. Soft furnishings, mattresses, rugs and stored items that were in floodwater are usually removed, because they are porous and hold moisture and contamination. Hard furniture can often be cleaned, but it should be checked for damp in the joints and the legs. Do not move affected items into clean rooms; leave them where they are for the assessment, and do not disturb the growth.

Mold in Flood-Damaged Homes: Room-by-Room Checks — Louisiana mold guide

The kitchen and bathrooms

The kitchen and bathrooms are the wet rooms, and they are the rooms where floodwater mixes with the plumbing and the appliances. Check under the sinks, behind the dishwasher and the washing machine, and around the toilets and the baths, for water that came in from the flood and for leaks that the flood may have caused. Check the cabinets, the floors beneath them, and the walls behind them, because floodwater can get behind a cabinet and stay there, hidden, long after the room looks dry.

Check the appliances too. A dishwasher, a washing machine or a fridge that was in floodwater may hold water inside it, and the floor beneath it may be wet even though the room looks dry. Do not switch on an appliance that was in floodwater until it has been checked, and do not use a bathroom or a kitchen that was flooded until the water and the waste systems have been checked. The plumbing and the drainage are part of the assessment, not an afterthought.

The attic and the crawl space

The attic and the crawl space are the parts of the house that are checked last and that hold the most hidden damage. The attic may have taken water through the roof, or through the vents, and the insulation may be wet and compressed. The crawl space may have filled with floodwater, and the joists and the subfloor may be wet, even though the rooms above look dry. Both spaces are confined and hard to access, and both need a professional assessment rather than a look from the doorway.

Do not enter the attic or the crawl space yourself after a flood. Floodwater may carry contamination, and the spaces may hold hazards you cannot see. In each room, work from the doorway: note what is visible, photograph it, and arrange a professional assessment before going further. The inspector will check the spaces with moisture readings, and will explain what was found and what the next steps are. The crawl space mold removal page and the attic mold removal page cover those spaces.

What to do after the checks

After the room-by-room checks, the next step is a professional assessment. The assessment maps the problem across the whole house, with moisture readings in the walls, the floors, the attic and the crawl space, and it identifies the extent of the growth and the work that is needed. The work follows the standard sequence: containment, removal, cleaning, drying and checking, and the drying is checked with moisture readings, not by eye, because a flooded home takes time to dry through.

Homes in Baton Rouge and Lake Charles follow the same sequence, and the mold remediation page explains the full process. A flood is a serious event, and a room-by-room check is the way to understand what it did to your home, so that the work that follows is aimed at the real damage, and not at the damage you happened to see first.

The months after a flood: what to watch

The months after a flood are when the hidden damage shows itself, because the water that soaked into the walls, the floors and the foundations takes time to reveal its effects. A stain that appears on a wall weeks after the flood, a floor that starts to warp, a musty smell that grows stronger, or a patch of growth that appears in a room that looked dry: these are the signs that the house is still drying, or that it never fully dried, and they are worth acting on promptly. A monthly check of every room, for the first year after a flood, is the habit that catches these signs early.

The check should cover the rooms that were flooded and the rooms that were not, because floodwater travels through walls and floors, and a room that was never flooded can still be damp. It should cover the attic and the crawl space, which hold hidden damage, and the kitchen and bathrooms, where the plumbing may have been affected. A home that is watched for a year after a flood is a home whose problems are caught early, and a homeowner who watches is a homeowner who can deal with the damage before it becomes a second flood of work.

Key Takeaways

Walls and floors are the first check after a flood, because they are the materials that floodwater touches first and soaks deepest.
The living rooms and bedrooms are the rooms where people spend their time, and they are the rooms where the signs of flood damage are most often noticed.
The kitchen and bathrooms are the wet rooms, and they are the rooms where floodwater mixes with the plumbing and the appliances.
The attic and the crawl space are the parts of the house that are checked last and that hold the most hidden damage.
After the room-by-room checks, the next step is a professional assessment.
The months after a flood are when the hidden damage shows itself, because the water that soaked into the walls, the floors and the foundations takes time to reveal its effects.

Questions About Mold in Flood-Damaged Homes: Room-by-Room Checks

What should I check first in a flood-damaged home?

Walls and floors: the waterline, staining above it, warping, peeling paint, soft spots, and a musty smell near the floor. Do not assume a wall or floor is dry because it looks dry on the surface; floodwater soaks deep into materials.

Should I check the attic and crawl space after a flood?

Yes, but do not enter them yourself. Floodwater may carry contamination and the spaces may hold hazards. Note what you can see from the access, take photographs, and get a professional assessment with moisture readings.

Can I use the kitchen or bathroom after a flood?

Not until the water and waste systems have been checked. Appliances that were in floodwater may hold water inside, and the plumbing and drainage are part of the assessment. Do not switch on an appliance that was in floodwater until it has been checked.

Is a flooded home a professional job?

In most cases, yes. A flooded home will usually exceed the ten square foot threshold in the walls and floors alone, and floodwater may carry contamination. After a flood, most rooms will have affected areas well past ten square feet, and EPA guidance says that scale of work needs a professional.

Your Next Step

If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Mold Removal page explains what that service covers, and the mold remediation page explains how the full sequence works when mold has spread to more than one room.

Do not enter flooded rooms while you wait, and if water is leaking, turn off the shut-off valve for that fixture where you can reach it safely from dry ground.

Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after moving in, and after bringing used fixtures home.

Mold help is available across Louisiana. See mold remediation in New Iberia, LA for one local example, or find your town on the service areas page.